I observe tha the physical content of all so-called 'space-
time measurements' only requires timed particle 
detections. And I point out the aspects of our current 
theories that render the abstraction of a spacetime 
extremely covenient. Among these particularly significant 
is the role of the assumed triviality of the geometry of 
momentum space, which makes room for an observer-
independent notion of locality. Starting from some recent 
studies of the  quantum-gravity problem, which stumbled 
upon hints of a  nontrivial geometry of momentum space, 
we might be led  to renouncing to absolute locality, 
thereby loosing a good part of the convenience of 
abstracting a spacetime.